I work PT at a grocery store just outside the hood and we have been going through active shooter training. Wide open isles of food doesn’t give you much protection.

Of course, I'm never unarmed, so I'm just as likely use my phone to blast out "Welcome to the Jungle" as loudly as possible and then ambush them when they come to investigate it. In my state,by law, I only have to justify the first shot - all others are considered justified, so long as I don't stand over them and issue a Coup de Gras with a shot to the head...